the stamping started in 55, but maybe late 55, I have seen 55's without it, but never seen later frames without it ....

GM didn't advertise the frame stamping, you won't find it in any factory literature

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics